This is already possible. When you Modify the properties of a Stack, you can select to set is as default. Go to the Stacks, tap on the selection button (the one with 4 squares and 3 checkmarks), tap on the Stack you wish to set as default. From the bottom of the screen tap on Modify. In the Modify screen tap on “Set as Default”. This stack will be the default stack now.

When you add a new picture to a Flickr album Flickr puts it at the bottom and does not apply the sorting that was set for the album. So every time I add a new photo I need to login to Flickr and select re-arrange newest to oldest which is very annoying. Can you add an option when this can be quickly done directly form the app?

when we're exploring thousands of people's stream or search result, it'll be great if we could know current number of the photo we're viewing (e.g. 1207 of 6790) so that we can precisely continue the exploration later..

Number/total of photos appears in details view and full screen (when bars and menus are visible).-—-
When in you are in details view or full screen view, the toolbar at the top shows current/total number of photos. Where else would you like to see this?

Not sure the correct name for this indexing, but in a long list of tags, there is an alphabet down the right hand side so you can jump into the list at a certain letter. The list of people I follow used to have this but now that it has sort options the index no longer shows. Scrolling through a very long list is tedious.

Have you tried the quick toolbar? In this toolbar you can see the avatar for the user When you are in full screen you can make this bar appear by either a tap and hold on the photo or by dragging it from the bottom of the screen.
More info on this toolbar here:https://ipont.uservoice.com/knowledgebase/articles/206728

It is possible to save your search results by sending them to a stack.
When you get back the results from the search, tap on the stack button (located on the top toolbar), the photos will be added to the default list stack. You can find more info about stacks here: https://ipont.uservoice.com/knowledgebase/articles/207137

What you see in FlickStackr as recent from contacts is what you see in Flickr in Following>Photos From. Here you can choose between 1 and 5 photos from contact. Which are the same two options you have in FlickStackr Home>Settings>Options>Recent Activity>Max photos per contact. In this option there are more values available, however to view exactly the same as Flickr you should only select 1 or 5, the other values are only there in case your really want to see more, but we don’t recommend using them as retrieving more photos may take a really long time.

This is possible in latest update (version 3.7)-
Currently photos that are taken with your device or that were downloaded to your device (i.e save to photo library) are uploaded automatically. Photos that are taken with external cameras and added to the camera roll are not uploaded automatically but we will be adding this functionality in a future update.

This is already possible, you can add a pass code to your accounts and only when entering the pass code you can have access to the photos.
To pass code protect:
1.Go to Home>Accounts
2. Tap on Edit
3. Tap on the blue arrow next to the account you wish to protect with a passcode.
4. In the Modify Account pop up, set Passcode Protected to “ON”
5. Enter a 4 digit passcode.
Your account is now protected with a passcode. Whenever you try to view any of the photos in that account, you will be prompted for the passcode.
If you wish to protect another account, follow the same steps again.

I have noticed strange download behaviour when dealing with videos and offline list stacks. When refreshing an offline stack, videos appear to try and download multiple times in parallel, the progress bar jumping around erratically between what seems to be three different download progress states. I think it is genuinely downloading two to three copies of the videos concurrently!

This has been fixed in v3.7-—
We have reproduced this issue. From initial investigation doesn’t seem to be downloading the video multiple times it is just the report of the progress that is returning an incorrect value, which is making the progress bar to go back and then jump. We will do further investigation and fix it in the next update.

Thanks for the update to get EXIF data in detailed view of Google Drive photos. However I believe you did not get the right data for the "Capture Date" or what Google Drive/Picasa EXIF data shown as "Camera Date". The "Catpture Time" in the FlickStackr EXIF data is the "Modified Date" as shown in Google Drive/Picasa EXIF data. Also the Flash mode in EXIF data is always set to "yes" which is not correct. Last suggestion is to post the capture date rather than the upload date when viewing and sorting the files.

Today - Dec. 20 - my uploaded photos are cropped wrong and ruined! If I custom crop a photo to a non standard size from the camera roll (I always do this) and upload from my iPhone I get some odd and wrong crop in Flickr!!!

My guess is that when you are seeing the photo on my phone you're getting the crop I did and are somehow getting the wrong size for the upload. (Maybe has something to do with new feature when uploading that you see my camera roll with cropped and not original sizes.)

This is a terrible bug and i can't use it until fixed.

Today - Dec. 20 - my uploaded photos are cropped wrong and ruined! If I custom crop a photo to a non standard size from the camera roll (I always do this) and upload from my iPhone I get some odd and wrong crop in Flickr!!!

My guess is that when you are seeing the photo on my phone you're getting the crop I did and are somehow getting the wrong size for the upload. (Maybe has something to do with new feature when uploading that you see my camera roll with cropped and not original sizes.)

Please try the latest update where we fixed all the situations where we found this could happen.-——-

This happens when you rotate and crop the photo in the Photo app. If you only crop the photo , the uploaded photo looks cropped properly, and if you only rotate the photo it is also fine. We will be fixing this in the next update

When I upload photos to Flickr, if the photo is on camera roll the FlickStackr just recognize 2048px photo. A curious thing happen when I edit photo directly in camera roll. Afetar this, the edit photo can be recognized by Fickstackr as a full resolution. How can I solve this?

This happens when “Prefer iPhoto Edited images” is enabled and the photos that you are uploading are not edited in iPhoto.. This option should only be enabled if you are editing photos with iPhoto. When this option is enabled the app assumes that you are editing in iPhoto and is requesting to the Photo Library the photo that has all the changes not matter the resolution, and this is what the Photo Library returns back. When the option is off the app just requests the largest resolution available, (Photo edits in Photo app are contained in this largest resolution). Go to Home>Settings>Options>Upload Defaults and turn off “Prefer iPhoto Edited images”.